Value Collection GH8792160 Counterbore 2.25in 5 Flute Hss

Product Description

The VALUE COLLECTION GH8792160 is a 5-flute interchangeable pilot counterbore designed for precision enlarging and finishing of pre-drilled holes to accept fastener heads, dowels, or mating hardware. Constructed from high speed steel with a bright, uncoated polished finish, this tool delivers consistent cutting performance in production and maintenance machining environments. The straight shank measures 1.75 inches in diameter and 7.375 inches in length, giving the tool a rigid setup in compatible toolholders. Overall length is 9.875 inches. The interchangeable pilot design accepts a 0.5-inch pilot shank diameter, allowing the counterbore diameter to be matched to the pilot without replacing the full tool body.

This counterbore is suited for use in vertical mills, drill presses, and machining centers where socket-head cap screws or similar fasteners require a recessed seat. It is intended for right-hand cutting and is appropriate for general metalworking applications in job shops, maintenance facilities, and manufacturing operations. The 5-flute geometry supports smoother surface finish at the counterbore floor compared to fewer-flute designs, making it a practical choice where fastener seating quality matters.

Key Features

• 2.25-inch counterbore diameter with 5-flute right-hand cutting geometry
• High speed steel construction for durability across a range of ferrous and non-ferrous materials
• Interchangeable pilot accepts a 0.5-inch pilot shank diameter for flexible setup
• Straight shank at 1.75 inches diameter for secure seating in standard toolholders
• Bright, polished uncoated finish — no coating buildup that could affect dimensional tolerance
• 9.875-inch overall length with a 7.375-inch shank length for extended reach applications

Compatibility

Designed as an OEM-style replacement or direct-use counterbore for machining setups requiring a 2.25-inch counterbore diameter with a 0.5-inch interchangeable pilot shank and a 1.75-inch straight shank interface.

Installation Notes

Installation should be performed by a qualified machinist familiar with rotating cutting tools and manual or CNC machine operation. Secure the straight shank firmly in a collet, end mill holder, or drill chuck rated for the shank diameter before operation. Ensure the pilot is properly seated and locked before engaging the workpiece. Always power down and lock out the machine spindle before changing the pilot or removing the tool from the holder.